Hey everyone, This is making me crazy I was under the truck yesterday changing U joints again. Any how I hadda take the shaft out totally this time and lost fluid from the TCase I hadn't changed the fluid in it yet because it had been gone over right before I bought the truck. The fluid that came out was Gear Oil this is not good right because the shop manual I have says to fill it with ATF not Gear Oil. So the question I have is do you fill it with ATF or Gear Oil. Thanks if you could just clear this up for me